It's easy to point a finger but fear is fear. If i were on a plane and someone wearing a turban sat next to me with a text in another language on their phone, I'd be at least a little bit worried. I'd be worried because of the near daily news I've heard/read of suicide bombings or terrorist attacks committed largely by Muslim persons on civilian populations. It's hard to remain civil and of good virtue when the perpetrators keep ending up to be the same identification of people.
My advice, never travel outside the US and Europe. It's terrifying. Everyone is foreign and speaks different languages!